1 /*
2 * Copyright 2011 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "SkBitmap.h"
9 #include "SkCanvas.h"
10 #include "SkData.h"
11 #include "SkDiscardableMemoryPool.h"
12 #include "SkImageGeneratorPriv.h"
13 #include "SkMatrixUtils.h"
14 #include "SkPaint.h"
15 #include "SkRandom.h"
16 #include "SkShader.h"
17 #include "SkSurface.h"
18 #include "Test.h"
19
20 // A BitmapFactory that always fails when asked to return pixels.
21 class FailureImageGenerator : public SkImageGenerator {
22 public:
FailureImageGenerator()23 FailureImageGenerator() : SkImageGenerator(SkImageInfo::MakeN32Premul(100, 100)) {}
24 protected:
25 // default onGetPixels() returns kUnimplemented, which is what we want.
26 };
27
28 // crbug.com/295895
29 // Crashing in skia when a pixelref fails in lockPixels
30 //
test_faulty_pixelref(skiatest::Reporter * reporter)31 static void test_faulty_pixelref(skiatest::Reporter* reporter) {
32 // need a cache, but don't expect to use it, so the budget is not critical
33 SkAutoTUnref<SkDiscardableMemoryPool> pool(
34 SkDiscardableMemoryPool::Create(10 * 1000, NULL));
35 SkBitmap bm;
36 bool installSuccess = SkInstallDiscardablePixelRef(SkNEW(FailureImageGenerator), &bm, pool);
37 REPORTER_ASSERT(reporter, installSuccess);
38 // now our bitmap has a pixelref, but we know it will fail to lock
39
40 SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(200, 200));
41 SkCanvas* canvas = surface->getCanvas();
42
43 const SkFilterQuality levels[] = {
44 kNone_SkFilterQuality,
45 kLow_SkFilterQuality,
46 kMedium_SkFilterQuality,
47 kHigh_SkFilterQuality,
48 };
49
50 SkPaint paint;
51 canvas->scale(2, 2); // need a scale, otherwise we may ignore filtering
52 for (size_t i = 0; i < SK_ARRAY_COUNT(levels); ++i) {
53 paint.setFilterQuality(levels[i]);
54 canvas->drawBitmap(bm, 0, 0, &paint);
55 }
56 }
57
58 ///////////////////////////////////////////////////////////////////////////////
59
rand_matrix(SkMatrix * mat,SkRandom & rand,unsigned mask)60 static void rand_matrix(SkMatrix* mat, SkRandom& rand, unsigned mask) {
61 mat->setIdentity();
62 if (mask & SkMatrix::kTranslate_Mask) {
63 mat->postTranslate(rand.nextSScalar1(), rand.nextSScalar1());
64 }
65 if (mask & SkMatrix::kScale_Mask) {
66 mat->postScale(rand.nextSScalar1(), rand.nextSScalar1());
67 }
68 if (mask & SkMatrix::kAffine_Mask) {
69 mat->postRotate(rand.nextSScalar1() * 360);
70 }
71 if (mask & SkMatrix::kPerspective_Mask) {
72 mat->setPerspX(rand.nextSScalar1());
73 mat->setPerspY(rand.nextSScalar1());
74 }
75 }
76
rand_size(SkISize * size,SkRandom & rand)77 static void rand_size(SkISize* size, SkRandom& rand) {
78 size->set(rand.nextU() & 0xFFFF, rand.nextU() & 0xFFFF);
79 }
80
treat_as_sprite(const SkMatrix & mat,const SkISize & size,unsigned bits)81 static bool treat_as_sprite(const SkMatrix& mat, const SkISize& size,
82 unsigned bits) {
83 return SkTreatAsSprite(mat, size.width(), size.height(), bits);
84 }
85
test_treatAsSprite(skiatest::Reporter * reporter)86 static void test_treatAsSprite(skiatest::Reporter* reporter) {
87 const unsigned bilerBits = kSkSubPixelBitsForBilerp;
88
89 SkMatrix mat;
90 SkISize size;
91 SkRandom rand;
92
93 // assert: translate-only no-filter can always be treated as sprite
94 for (int i = 0; i < 1000; ++i) {
95 rand_matrix(&mat, rand, SkMatrix::kTranslate_Mask);
96 for (int j = 0; j < 1000; ++j) {
97 rand_size(&size, rand);
98 REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, 0));
99 }
100 }
101
102 // assert: rotate/perspect is never treated as sprite
103 for (int i = 0; i < 1000; ++i) {
104 rand_matrix(&mat, rand, SkMatrix::kAffine_Mask | SkMatrix::kPerspective_Mask);
105 for (int j = 0; j < 1000; ++j) {
106 rand_size(&size, rand);
107 REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, 0));
108 REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, bilerBits));
109 }
110 }
111
112 size.set(500, 600);
113
114 const SkScalar tooMuchSubpixel = 100.1f;
115 mat.setTranslate(tooMuchSubpixel, 0);
116 REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, bilerBits));
117 mat.setTranslate(0, tooMuchSubpixel);
118 REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, bilerBits));
119
120 const SkScalar tinySubPixel = 100.02f;
121 mat.setTranslate(tinySubPixel, 0);
122 REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, bilerBits));
123 mat.setTranslate(0, tinySubPixel);
124 REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, bilerBits));
125
126 const SkScalar twoThirds = SK_Scalar1 * 2 / 3;
127 const SkScalar bigScale = (size.width() + twoThirds) / size.width();
128 mat.setScale(bigScale, bigScale);
129 REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, false));
130 REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, bilerBits));
131
132 const SkScalar oneThird = SK_Scalar1 / 3;
133 const SkScalar smallScale = (size.width() + oneThird) / size.width();
134 mat.setScale(smallScale, smallScale);
135 REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, false));
136 REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, bilerBits));
137
138 const SkScalar oneFortyth = SK_Scalar1 / 40;
139 const SkScalar tinyScale = (size.width() + oneFortyth) / size.width();
140 mat.setScale(tinyScale, tinyScale);
141 REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, false));
142 REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, bilerBits));
143 }
144
assert_ifDrawnTo(skiatest::Reporter * reporter,const SkBitmap & bm,bool shouldBeDrawn)145 static void assert_ifDrawnTo(skiatest::Reporter* reporter,
146 const SkBitmap& bm, bool shouldBeDrawn) {
147 for (int y = 0; y < bm.height(); ++y) {
148 for (int x = 0; x < bm.width(); ++x) {
149 if (shouldBeDrawn) {
150 if (SK_ColorTRANSPARENT == *bm.getAddr32(x, y)) {
151 REPORTER_ASSERT(reporter, false);
152 return;
153 }
154 } else {
155 // should not be drawn
156 if (SK_ColorTRANSPARENT != *bm.getAddr32(x, y)) {
157 REPORTER_ASSERT(reporter, false);
158 return;
159 }
160 }
161 }
162 }
163 }
164
test_wacky_bitmapshader(skiatest::Reporter * reporter,int width,int height,bool shouldBeDrawn)165 static void test_wacky_bitmapshader(skiatest::Reporter* reporter,
166 int width, int height, bool shouldBeDrawn) {
167 SkBitmap dev;
168 dev.allocN32Pixels(0x56F, 0x4f6);
169 dev.eraseColor(SK_ColorTRANSPARENT); // necessary, so we know if we draw to it
170
171 SkMatrix matrix;
172
173 SkCanvas c(dev);
174 matrix.setAll(-119.34097f,
175 -43.436558f,
176 93489.945f,
177 43.436558f,
178 -119.34097f,
179 123.98426f,
180 0, 0, SK_Scalar1);
181 c.concat(matrix);
182
183 SkBitmap bm;
184 if (bm.tryAllocN32Pixels(width, height)) {
185 // allow this to fail silently, to test the code downstream
186 }
187 bm.eraseColor(SK_ColorRED);
188
189 matrix.setAll(0.0078740157f,
190 0,
191 SkIntToScalar(249),
192 0,
193 0.0078740157f,
194 SkIntToScalar(239),
195 0, 0, SK_Scalar1);
196 SkShader* s = SkShader::CreateBitmapShader(bm, SkShader::kRepeat_TileMode,
197 SkShader::kRepeat_TileMode, &matrix);
198
199 SkPaint paint;
200 paint.setShader(s)->unref();
201
202 SkRect r = SkRect::MakeXYWH(681, 239, 695, 253);
203 c.drawRect(r, paint);
204
205 assert_ifDrawnTo(reporter, dev, shouldBeDrawn);
206 }
207
208 /*
209 * Original bug was asserting that the matrix-proc had generated a (Y) value
210 * that was out of range. This led (in the release build) to the sampler-proc
211 * reading memory out-of-bounds of the original bitmap.
212 *
213 * We were numerically overflowing our 16bit coordinates that we communicate
214 * between these two procs. The fixes was in two parts:
215 *
216 * 1. Just don't draw bitmaps larger than 64K-1 in width or height, since we
217 * can't represent those coordinates in our transport format (yet).
218 * 2. Perform an unsigned shift during the calculation, so we don't get
219 * sign-extension bleed when packing the two values (X,Y) into our 32bit
220 * slot.
221 *
222 * This tests exercises the original setup, plus 3 more to ensure that we can,
223 * in fact, handle bitmaps at 64K-1 (assuming we don't exceed the total
224 * memory allocation limit).
225 */
test_giantrepeat_crbug118018(skiatest::Reporter * reporter)226 static void test_giantrepeat_crbug118018(skiatest::Reporter* reporter) {
227 static const struct {
228 int fWidth;
229 int fHeight;
230 bool fExpectedToDraw;
231 } gTests[] = {
232 { 0x1b294, 0x7f, false }, // crbug 118018 (width exceeds 64K)
233 { 0xFFFF, 0x7f, true }, // should draw, test max width
234 { 0x7f, 0xFFFF, true }, // should draw, test max height
235 { 0xFFFF, 0xFFFF, false }, // allocation fails (too much RAM)
236 };
237
238 for (size_t i = 0; i < SK_ARRAY_COUNT(gTests); ++i) {
239 test_wacky_bitmapshader(reporter,
240 gTests[i].fWidth, gTests[i].fHeight,
241 gTests[i].fExpectedToDraw);
242 }
243 }
244
245 ///////////////////////////////////////////////////////////////////////////////
246
test_nan_antihair()247 static void test_nan_antihair() {
248 SkBitmap bm;
249 bm.allocN32Pixels(20, 20);
250
251 SkCanvas canvas(bm);
252
253 SkPath path;
254 path.moveTo(0, 0);
255 path.lineTo(10, SK_ScalarNaN);
256
257 SkPaint paint;
258 paint.setAntiAlias(true);
259 paint.setStyle(SkPaint::kStroke_Style);
260
261 // before our fix to SkScan_Antihair.cpp to check for integral NaN (0x800...)
262 // this would trigger an assert/crash.
263 //
264 // see rev. 3558
265 canvas.drawPath(path, paint);
266 }
267
check_for_all_zeros(const SkBitmap & bm)268 static bool check_for_all_zeros(const SkBitmap& bm) {
269 SkAutoLockPixels alp(bm);
270
271 size_t count = bm.width() * bm.bytesPerPixel();
272 for (int y = 0; y < bm.height(); y++) {
273 const uint8_t* ptr = reinterpret_cast<const uint8_t*>(bm.getAddr(0, y));
274 for (size_t i = 0; i < count; i++) {
275 if (ptr[i]) {
276 return false;
277 }
278 }
279 }
280 return true;
281 }
282
283 static const int gWidth = 256;
284 static const int gHeight = 256;
285
create(SkBitmap * bm,SkColor color)286 static void create(SkBitmap* bm, SkColor color) {
287 bm->allocN32Pixels(gWidth, gHeight);
288 bm->eraseColor(color);
289 }
290
DEF_TEST(DrawBitmapRect,reporter)291 DEF_TEST(DrawBitmapRect, reporter) {
292 SkBitmap src, dst;
293
294 create(&src, 0xFFFFFFFF);
295 create(&dst, 0);
296
297 SkCanvas canvas(dst);
298
299 SkIRect srcR = { gWidth, 0, gWidth + 16, 16 };
300 SkRect dstR = { 0, 0, SkIntToScalar(16), SkIntToScalar(16) };
301
302 canvas.drawBitmapRect(src, &srcR, dstR, NULL);
303
304 // ensure that we draw nothing if srcR does not intersect the bitmap
305 REPORTER_ASSERT(reporter, check_for_all_zeros(dst));
306
307 test_nan_antihair();
308 test_giantrepeat_crbug118018(reporter);
309
310 test_treatAsSprite(reporter);
311 test_faulty_pixelref(reporter);
312 }
313